docstr: Sets the opacity of unselected lines. The default "auto"
  decreases the opacity smoothly as the number of lines
  increases. Use 1 to achieve exact `unselected.line.color`.
  
  The 'opacity' property is a number and may be specified as:
    - An int or float in the interval [0, 1]
  
  Returns
  -------
  int|float
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code: def opacity(self):
      """
      Sets the opacity of unselected lines. The default "auto"
      decreases the opacity smoothly as the number of lines
      increases. Use 1 to achieve exact `unselected.line.color`.
  
      The 'opacity' property is a number and may be specified as:
        - An int or float in the interval [0, 1]
  
      Returns
      -------
      int|float
      """
      return self["opacity"]
  
file_path: plotly.py/packages/python/plotly/plotly/graph_objs/parcoords/unselected/_line.py
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 3 for calling the Line obj's underlying member method code with example usage: obj.opacity() and returns: self